/*  Nanhill Util JavaScript Library
 * 	
 *  version 1.0.1 2006-03-31
 *
 *  (c) 2005 alin <xalinx@gmail.com>
 *	need prototype.js
 * 
 *  Nanhill javascript library is freely distributable under the terms 
 * 	of an Apache license. For details, see the Nanhill web site: 
 *  http://sourceforge.net/projects/nanhillplatform
/*--------------------------------------------------------------------------*/
var nh = {
	version: '1.0.1',
	prototypeVersion: parseFloat(Prototype.Version.split(".")[0] + "." + Prototype.Version.split(".")[1])
};
nh.Util = function() {};
nh.Util.debug = function(message) {
  nh.Util._log(message);
}
nh.Util._log =  function(errorStr) {
	var logPane = $("nh.Util_log_pane");
	if (logPane == null) {
		var el = document.createElement('DIV');
		el.id = "nh.Util_log_pane";
		el.style.cssText="top:1px;font-family:Verdana;font-size:11px;border:1px solid #00CC00;background-color:#A4FFA4;padding:1px;position:absolute; right:1px; width:300px; height:500px; z-index:10000";
		document.body.appendChild(el);
		logPane = el;
	}
	logPane.innerHTML +=  errorStr + "<br/>";
};
window.onhelp = function() {
	var logPane = $("nh.Util_log_pane");
	logPane.style.dispaly = logPane.style.display == 'none' ? 'block': 'none';
	return false;
}
/**
 * Trim input.
 */
nh.Util.trim = function(input)
{
	if(typeof input == 'string') {
    	return input.replace(/(^\s*)|(\s*$)/g, "");
	} else {
		return input;
	}
};
/**
 * Like typeOf except that more information for an object is returned other than "object"
 */
nh.Util.typeOf = function(x) {
  if (null == x) {
  	return "null";
  }
  var reply = typeof x;
  if (reply == "object") {
    reply = Object.prototype.toString.apply(x);  // Returns "[object class]"
    reply = reply.substring(8, reply.length-1);  // Just get the class bit
  }
  return reply;
};
/**
 *  Date detector. Work around the lack of instanceof in some browsers.
 */
nh.Util.isDate = function(data) {
  return (data && data.toUTCString) ? true : false;
};
/**
 * Array detector. Work around the lack of instanceof in some browsers.
 */
nh.Util.isArray = function(data) {
  return (data && data.join) ? true : false;
};
/**
 * Email address checker.
 */
nh.Util.checkEmail = function (email) {
    if (typeof email != 'string') {
      return false;
    }
	var reEmail = /^([A-Za-z0-9])(\w)+@(\w)+(\.)(com|com\.cn|net|cn|net\.cn|org|biz|info|gov|gov\.cn|edu|edu\.cn)/;
	if (!email.match(reEmail)) {
	        return false;
	}
	return true;
};

nh.Util.getAllChildren = function (e) {
  // Returns all children of element. Workaround required for IE5/Windows. Ugh.
  return e.all ? e.all : e.getElementsByTagName('*');
};

nh.Util.createXmlHttp = function () {
	try {
		// NS & MOZ
		if (window.XMLHttpRequest) {
			var req = new XMLHttpRequest();
			if (req.readyState == null) {
				req.readyState = 1;
				req.addEventListener("load", function () {
					req.readyState = 4;
					if (typeof req.onreadystatechange == "function")
						req.onreadystatechange();
				}, false);
			}
			return req;
		}
		// IE
		if (window.ActiveXObject) {
			return new ActiveXObject(nh.Util.getXmlHttpPrefix() + ".XmlHttp");
		}
	} catch (ex) {};
	throw new Error("Your browser does not support XmlHttp objects");
};
/**
 * get singleton activeX xmlhttp prefix 
 */
nh.Util.getXmlHttpPrefix = function() {
	if (nh.Util.getXmlHttpPrefix.prefix)
		return nh.Util.getXmlHttpPrefix.prefix;
	var prefixes = ["MSXML2", "Microsoft", "MSXML", "MSXML3"];
	var o;
	for (var i = 0; i < prefixes.length; i++) {
		try {
			o = new ActiveXObject(prefixes[i] + ".XmlHttp");
			return nh.Util.getXmlHttpPrefix.prefix = prefixes[i];
		}
		catch (ex) {};
	}
	throw new Error("Could not find an installed ActiveX XMLHttp object");
}
/*
   Behaviour v1.1 by Ben Nolan, June 2005. Based largely on the work
   of Simon Willison (see comments by Simon below).

   Description:
   	
   	Uses css selectors to apply javascript behaviours to enable
   	unobtrusive javascript in html documents.
   	
   Usage:   
   
	var myrules = {
		'b.someclass' : function(element){
			element.onclick = function(){
				alert(this.innerHTML);
			}
		},
		'#someid u' : function(element){
			element.onmouseover = function(){
				this.innerHTML = "BLAH!";
			}
		}
	};
	
	Behaviour.register(myrules);
	
	// Call Behaviour.apply() to re-apply the rules (if you
	// update the dom, etc).

   License:
   
   	This file is entirely BSD licensed.
   	
   More information:
   	
   	http://ripcord.co.nz/behaviour/
   
*/   

nh.Behaviour = {
	list : new Array,
	
	register : function(sheet){
		nh.Behaviour.list.push(sheet);
	},
	
	start : function(){
		nh.Behaviour.addLoadEvent(function(){
			nh.Behaviour.apply();
		});
	},
	
	apply : function(){
		for (h=0;sheet=nh.Behaviour.list[h];h++){
			for (selector in sheet){
				list = document.getElementsBySelector(selector);
				
				if (!list){
					continue;
				}

				for (i=0;element=list[i];i++){
					sheet[selector](element);
				}
			}
		}
	},
	
	addLoadEvent : function(func){
		var oldonload = window.onload;
		
		if (typeof window.onload != 'function') {
			window.onload = func;
		} else {
			window.onload = function() {
				oldonload();
				func();
			}
		}
	}
}

nh.Behaviour.start();

/*
   The following code is Copyright (C) Simon Willison 2004.

   document.getElementsBySelector(selector)
   - returns an array of element objects from the current document
     matching the CSS selector. Selectors can contain element names, 
     class names and ids and can be nested. For example:
     
       elements = document.getElementsBySelect('div#main p a.external')
     
     Will return an array of all 'a' elements with 'external' in their 
     class attribute that are contained inside 'p' elements that are 
     contained inside the 'div' element which has id="main"

   New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
   See http://www.w3.org/TR/css3-selectors/#attribute-selectors

   Version 0.4 - Simon Willison, March 25th 2003
   -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
   -- Opera 7 fails 
*/

document.getElementsBySelector = function(selector) {
  // Attempt to fail gracefully in lesser browsers
  if (!document.getElementsByTagName) {
    return new Array();
  }
  // Split selector in to tokens
  var tokens = selector.split(' ');
  var currentContext = new Array(document);
  for (var i = 0; i < tokens.length; i++) {
    token = tokens[i].replace(/^\s+/,'').replace(/\s+$/,'');;
    if (token.indexOf('#') > -1) {
      // Token is an ID selector
      var bits = token.split('#');
      var tagName = bits[0];
      var id = bits[1];
      var element = document.getElementById(id);
      if (tagName && element.nodeName.toLowerCase() != tagName) {
        // tag with that ID not found, return false
        return new Array();
      }
      // Set currentContext to contain just this element
      currentContext = new Array(element);
      continue; // Skip to next token
    }
    if (token.indexOf('.') > -1) {
      // Token contains a class selector
      var bits = token.split('.');
      var tagName = bits[0];
      var className = bits[1];
      if (!tagName) {
        tagName = '*';
      }
      // Get elements matching tag, filter them for class selector
      var found = new Array;
      var foundCount = 0;
      for (var h = 0; h < currentContext.length; h++) {
        var elements;
        if (tagName == '*') {
            elements = nh.Util.getAllChildren(currentContext[h]);
        } else {
            elements = currentContext[h].getElementsByTagName(tagName);
        }
        for (var j = 0; j < elements.length; j++) {
          found[foundCount++] = elements[j];
        }
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      for (var k = 0; k < found.length; k++) {
        if (found[k].className && found[k].className.match(new RegExp('\\b'+className+'\\b'))) {
          currentContext[currentContextIndex++] = found[k];
        }
      }
      continue; // Skip to next token
    }
    // Code to deal with attribute selectors
    if (token.match(/^(\w*)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/)) {
      var tagName = RegExp.$1;
      var attrName = RegExp.$2;
      var attrOperator = RegExp.$3;
      var attrValue = RegExp.$4;
      if (!tagName) {
        tagName = '*';
      }
      // Grab all of the tagName elements within current context
      var found = new Array;
      var foundCount = 0;
      for (var h = 0; h < currentContext.length; h++) {
        var elements;
        if (tagName == '*') {
            elements = nh.Util.getAllChildren(currentContext[h]);
        } else {
            elements = currentContext[h].getElementsByTagName(tagName);
        }
        for (var j = 0; j < elements.length; j++) {
          found[foundCount++] = elements[j];
        }
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      var checkFunction; // This function will be used to filter the elements
      switch (attrOperator) {
        case '=': // Equality
          checkFunction = function(e) { return (e.getAttribute(attrName) == attrValue); };
          break;
        case '~': // Match one of space seperated words 
          checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('\\b'+attrValue+'\\b'))); };
          break;
        case '|': // Match start with value followed by optional hyphen
          checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('^'+attrValue+'-?'))); };
          break;
        case '^': // Match starts with value
          checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) == 0); };
          break;
        case '$': // Match ends with value - fails with "Warning" in Opera 7
          checkFunction = function(e) { return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length); };
          break;
        case '*': // Match ends with value
          checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) > -1); };
          break;
        default :
          // Just test for existence of attribute
          checkFunction = function(e) { return e.getAttribute(attrName); };
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      for (var k = 0; k < found.length; k++) {
        if (checkFunction(found[k])) {
          currentContext[currentContextIndex++] = found[k];
        }
      }
      // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
      continue; // Skip to next token
    }
    
    if (!currentContext[0]){
    	return;
    }
    
    // If we get here, token is JUST an element (not a class or ID selector)
    tagName = token;
    var found = new Array;
    var foundCount = 0;
    for (var h = 0; h < currentContext.length; h++) {
      var elements = currentContext[h].getElementsByTagName(tagName);
      for (var j = 0; j < elements.length; j++) {
        found[foundCount++] = elements[j];
      }
    }
    currentContext = found;
  }
  return currentContext;
}

/* That revolting regular expression explained 
/^(\w+)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/
  \---/  \---/\-------------/    \-------/
    |      |         |               |
    |      |         |           The value
    |      |    ~,|,^,$,* or =
    |   Attribute 
   Tag
*/



